Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Company's Current Debt Portfolio (Parenthetical) (Detail)

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Long-Term Debt - Summary of Company's Current Debt Portfolio (Parenthetical) (Detail)
6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
6.75% Senior Notes, due July 2022 [Member]
Jan. 22, 2014
6.75% Senior Notes, due July 2022 [Member]
Jun. 30, 2014
7.50% Senior Notes, due August 2020 [Member]
Dec. 31, 2013
7.50% Senior Notes, due August 2020 [Member]
Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
Jun. 30, 2014
9.125% Senior Notes, due April 2018 [Member]
Dec. 31, 2013
9.125% Senior Notes, due April 2018 [Member]
Jul. 30, 2013
9.125% Senior Notes, due April 2018 [Member]
Debt Instrument [Line Items]                
Debt instrument maturity date July 2022   August 2020 August 2020   April 2018 April 2018  
Debt instrument fixed interest rate 6.75% 6.75% 7.50% 7.50% 7.50% 9.125% 9.125% 9.125%